The tissue is quite simply defined in the biological sense as an ensemble cast featuring similar cells of the identical sources that collectively carry out a specific function. In animals, cells are grouped together to form tissues. These tissues vary in their structure, function, and origin.The four important tissues in an animal body are epithelial, connective, muscular and nervous tissues. Let us have a glimpse of each type of animal tissue.
Types of Animal Tissue
Epithelial tissue shields the surface of all internal as well as external organs. All layers and organs in the body are lined by a group of tissues which are commonly referred to as epithelium. This animal tissue is highly permeable as it plays a significant role in the exchange of substances across the cells and helps in maintaining the osmoregulation. Depending on the number of layers, the epithelium is divided into two types viz.simple epithelium and compound epithelium. The main functions of epithelial tissue include protection, secretion, sensation, and absorption. They act as a protective barrier against injury and invasion of pathogens like viruses, bacteria, etc. Some epithelial also secrete substances like digestive juices or absorb nutrients and prevents water loss from the body.
Connective tissue supports in connecting or separating other tissues or organs of the body as the name suggests. A fibrous connective tissue is strong and is found in areas like ligaments, which basically connects bones to one another. Connective tissues happen to be the most abundant tissues of complex animals as they include cartilage, bone, adipose, and blood. All connective tissues except blood tend to secrete structural proteins called collagen or elastin. There are different types of connective tissues like Loose Connective tissue, Dense Connective tissue, and Specialized Connective tissue.
This animal tissue is again divided into three types which are cardiac, smooth, and skeletal. Skeletal is a voluntary type which is made by the contraction of skeletal parts. The smooth tissue found in walls of blood vessels and internal organs are an involuntary type. The last type viz. cardiac muscle is found only in the walls of the heart and it is also involuntary in nature.
The neural or nerve tissues happen to exert control over the body’s responses to changing conditions. Neurons, the excitable cells are the units of the neural system. It is comprised of specialized cells which receive stimuli and conduct the impulses to and from different parts of the body. Its functions include processing and transferring information.
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